images = new Array(5);

images[0] = "<a href = 'http://www.graphicsoptimization.com/gallery/im16.htm'><img src='http://www.graphicsoptimization.com/im/th/th16.png' alt=''></a>";
images[1] = "<a href = 'http://www.graphicsoptimization.com/gallery/im17.htm'><img src='http://www.graphicsoptimization.com/im/th/th17.jpg' alt=''></a>";
images[2] = "<a href = 'http://www.graphicsoptimization.com/gallery/im18.htm'><img src='http://www.graphicsoptimization.com/im/th/th18.jpg' alt=''></a>";
images[3] = "<a href = 'http://www.graphicsoptimization.com/gallery/im19.htm'><img src='http://www.graphicsoptimization.com/im/th/th19.jpg' alt=''></a>";
images[4] = "<a href = 'http://www.graphicsoptimization.com/gallery/im20.htm'><img src='http://www.graphicsoptimization.com/im/th/th20.png' alt=''></a>";

index = Math.floor(Math.random() * images.length);

document.write(images[index]);